@media (max-width:768px){
    .header-c,
    .banner-c,
    /* 主要内容 */
    .content-c,
    /* 服务器 */
    .server-c,
    /* 消息,新闻 */
    .news-c,
    /* 多余的 */
    /* .surplus-c, */
    .footer-c{
    width:90%;
    }
   .header .header-c .nav{
     display: none;
    }
    .header .header-c .box{
        display: block;
        width: 80px;
        height: 100px;
        float: right;
        margin-top: 35px;
        transition:all .3s ease-in-out;
}
    .header .header-c .box .lin{
        width: 40px;
        height: 2px;
        background-color: #888;
        margin: 10px auto 0;
        transition: all .4s ease;
}
    .header .header-c .box .lin:first-child{
        margin-top: 5px;
        transition-delay: .3s;
    }
    .header .header-c .box .lin:last-child{
        transition-delay: .3s;
    }
    .active .lin{
        transition: .3s linear;
}
    .active .lin:nth-child(1){
        transform: translateY(12px);
}
    .active .lin:nth-child(2){
    width: 0;
}
    .active .lin:nth-child(3){
    transform: translateY(-12px) rotate(90deg);
}
    .active{
        transform: rotate(45deg);
        transition-delay: .3s linear;
}   
    .close{
    transition: .3s linear;
}
    /* 隐形头部导航 */
.header .item-i{
    display:none;
    position: absolute;
    top: 100px;
    left: 0;
    width: 100%;
    height: 300px;
    background-color: #fff;
}
.header .item-i .item{
    width: 100%;
    line-height: 45px;
    font-size: 20px;
    text-align: center;
    border-bottom: 2px solid #888;
}
.header .item-i .item a{
    color: #888;
 }
 
    /* 页脚 */
.footer .footer-c .di .d{
    width: 100%;
    margin-top: 20px;
    text-align:center;
}
.footer .footer-c .di .dl{
    display: none;
}
}